• Band-edge modification and mid-infrared absorption of co-deposited FexZn1-xS thin films 

      Molland, Nelly-Ann; Ghadyani, Zahra; Karhu, Eric Andrew; Poggio, Stefano; Nematollahi, Mohammadreza; Kildemo, Morten; Reenaas, Turid Worren; BelBruno, Joseph; Gibson, Ursula (Journal article; Peer reviewed, 2015)
      The bandgap of iron-doped ZnS has been reported by others to change significantly under the addition of a few atomic percent of iron, which would have significant implications for solar energy. Here, thin films of FexZn1-xS ...
    • Evidence of chromium-cobalt binary cluster formation by pulsed laser evaporation 

      Burnin, Andrei; BelBruno, Joseph; Gibson, Ursula (Journal article, 2015)
      We report on the use of time of flight mass spectrometry to investigate the cluster spectrum resulting from Nd-YAG ablation of a Co-Cr target. Cr+ clusters dominated the spectrum, with Co+ clusters as the second most intense ...
    • Properties of transition metal doped cadmium sulfide hexamers and dodecamers 

      Poggio, Stefano; King, Jonathan; BelBruno, Joseph (Journal article; Peer reviewed, 2015)
      The electronic and geometrical properties of endohedrally and substitutionally doped Cd6S6 and Cd12S12 clusters were analyzed by means of Density Functional Theory. The results are compared to those of ZnS clusters of the ...
    • Properties of Transition Metal Substituted Zinc Sulfide Hexamers and Dodecamers 

      Poggio, Stefano; Wang, Brendan; Gibson, Ursula; BelBruno, Joseph (Journal article, 2015)
      Density functional theory was used to study the structural and electronic properties of endohedrally- and substitutionally-doped Zn6S6 and Zn12S12 clusters with first-row transition metal atoms. Generally, the lowest energy ...
    • Vapor deposited Cr-doped ZnS thin films: Towards optically pumped mid-infrared waveguide lasers 

      Karhu, Eric Andrew; Ildstad, Charles Rutherford; Poggio, Stefano; Furtula, Vedran; Tolstik, Nikolai; Sorokina, Irina T; BelBruno, Joseph; Gibson, Ursula (Journal article; Peer reviewed, 2016)
      Compact, affordable mid-IR lasers require the development of gain materials in waveguide form. We report on the high vacuum deposition of Cr:ZnS films with concentration ranging from 1018-1020 dopants/cm3 . At low ...